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Advancement > BMR- Fireman Ch.3, 4, & 5 > Flashcards

BMR- Fireman Ch.3, 4, & 5 Flashcards

1
Q

Atmospheric pressure is what psia at sea level?

A

14.7

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2
Q

A peculiar thing happens to water and steam at an absolute pressure of 3206.2 psia and the corresponding saturation temperature at 705.40°F. At this point, called what, the vapor and liquid are indistinguishable?

A

Critical point

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3
Q

Boilers designed to operate at pressures and temperatures above the critical point are what boilers?

A

Supercritical boilers

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4
Q

As the steam leaves or exhaust from the LP turbine, it enters what system?

A

Condensate

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5
Q

What is the dividing line between condensate and feed water?

A

DFT

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6
Q

What is positioned on the boiler to perform one basic function, which is to act as a preheater?

A

Economizer

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7
Q

What systems supply steam at the pressures and temperatures required cooperate many systems and machinery, both inside and outside engineering spaces?

A

Auxiliary steam

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8
Q

The function of what in the steam cycle is to convert water into steam?

A

Boiler

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9
Q

What is a compartment contains boilers and the operating station for firing the boiler?

A

Fire room

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10
Q

What is a compartment containing boilers but not containing the station for firing or operating the boiler?

A

Boiler room

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11
Q

What is a compartment containing boilers and the station for firing or operating the boilers and main propulsion engines?

A

Main machinery room

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12
Q

What is the time during which the boilers have fires lighted until fires are secured?

A

Steaming hours

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13
Q

Boiler overload capacity is usually what percent of boiler full-power capacity, for either steaming rate or firing rate, as specified for the individual installation?

A

120%

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14
Q

What is the actual temperature at the superheater outlet?

A

Operating temperature

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15
Q

Naval boilers are divided into two classes, propulsion and what?

A

Auxiliary

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16
Q

In what boilers do the gases of combustion flow through the tubes and thereby heat the water that surrounds the tubes?

A

Fire-tube boilers

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17
Q

All propulsion boilers used in naval ships are of what type?

A

Water-tube

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18
Q

In what boilers does the water flows through the tubes and is heated by the gases of combustion that fill the furnace and heat the outside metal surfaces of the tubes?

A

Water-tube boilers

19
Q

What term is commonly used in engineering to describe any tube , chamber, drum, or similar piece to which tubes or pipes are connected in such a way as to permit the flow of fluid from one tube ( or group of tubes ) to another?

A

Header

20
Q

Most boilers in use in naval propulsion plants operate with a slight air pressure (seldom over what psig) in the boiler furnace?

A

5

21
Q

On almost all boilers used in the propulsion plants of naval ships, the superheater tubes are protected from radiant heat by what?

A

Water screen tubes

22
Q

Header-type boilers and some older drum-type boilers are often called 400-PSI BOILERS even though their operating pressures range from about 435 psi to what psi?

A

700

23
Q

What provides a space for the saturated steam generated in the tubes and for the separation of moisture from the steam?

A

Steam drum

24
Q

What equalizes the distribution of water to the generating tubes?

A

Water drum

25
Q

The tubes that lead from the water drum to the steam drum are called what?

A

Generating tubes

26
Q

Components of the steam drum area are known as what?

A

Internal fittings

27
Q

What is the large, room-like space where air and fuel are mixed for the combustion (fire) that heats the water in the drums, tubes, and headers?

A

Furnace

28
Q

Air is forced into the furnace by what?

A

Forced draft blower

29
Q

What, which are devices for producing a fine spray, breakup the fuel oil into very few be particles?

A

Atomizers

30
Q

The steam-assist atomizer employs what psi of steam mixed with the fuel oil to help atomize the fuel oil?

A

150

31
Q

What atomizer is unique in that it is the only atomizer in use in the Navy that has moving parts?

A

Vented-plunger

32
Q

What is a small boiler that supplies steam for distilling plants, space heating, oil heating, water heating, galley, and laundry?

A

Auxiliary boiler

33
Q

Two methods are used in turbine design and construction to get the desired results from a turbine. These are the impulse principle and what other principle?

A

Reaction

34
Q

What term means that the force that turns the turbine comes from the impact of the steam on the blades?

A

Impulse

35
Q

Turbine casings are made of what for non superheated steam applications?

A

Cast carbon steel

36
Q

For turbine casings used in submarines, a percentage of what material is used, which is more resistant to steam erosion than carbon steel?

A

Chrome stainless steel

37
Q

The primary function of the nozzles is to convert the thermal energy of steam into what energy?

A

Kinetic

38
Q

The primary purpose of what is to carry the moving blades that convert the steam’s kinetic energy to rotating mechanical energy?

A

Turbine rotor

39
Q

The rotor of every turbine must be positioned radially and axially by what?

A

Bearings

40
Q

What carry and support the weight of the rotor and maintain the correct radial clearance between the rotor and casing?

A

Radial bearings

41
Q

What prevent the leaking of the steam out of or air into the turbine casing where the turbine rotor shaft extends through the turbine casing?

A

Shaft packing glands

42
Q

What packing consists of rows of metallic strips or fins?

A

Labyrinth

43
Q

What restricts the passage of steam along the shaft in much the same manner as labyrinth packing strips?

A

Carbon packing rings

44
Q

The four areas of operation in a main steam system are generation, expansion, condensation, and what?

A

Feed

Advancement (3 decks)

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